What are FeedBackLoops aka Complaint Loops

Feed-Back-Loops (FBL)  are a way for  large  ISPs to let you  know that  someone has made a complaint  to THEM about a  message we have sent them  on your behalf.   This is not a bounce, or reply,  but a  mechanism that is used by their customers to flag  emails we  send them.  If  that  complaint ratio get's too high they  might decide to block us  altogether, which would  affect us  and our other customers.  A complaint rate of 1.5% or less is acceptable on this platform but if you are adhering to our Terms of Use and Acceptable Use Policies as is required, you should never receive complaints.

For a detailed description by the people that define the FeedBackLoop concept, go M3AAWG FBL RESOURCES.

You need to set up FBLs at the following providers, at a minimum do those that are flagged:

1. yahoo/aol: YAHOO SENDER HUB  <-- must have
2. Bluetie
3. Comcast -- must have
4. Cox -- good to have
5. Earthlink
6. Gmail -- they do not have, must set up postmaster at google
7. Hotmail -- (all microsoft properties) must have. also do SNDS 
8. Mail.ru
9. Rackspace -- important
10. Roadrunner
11. Synacor -- They sell licenses and  host an Outlook competitor that  works really great!
12. Terra
13. Tucows -- important
14. United Online
15. USA.net
16. Zoho

Try to get them all set up when you can.